An instruction only sometimes applies — like a special discount policy only for orders over $500. Where does the exam expect this kind of conditional guidance to live?

Answer: B — Placed where its scope is clear — often the tool description or a clearly scoped instruction block, not general system-level text

Instruction and prompt placement across components is explicitly tested — conditional or scoped guidance belongs where its scope is unambiguous, not mixed indiscriminately into a general system prompt where it competes with everything else for attention.